Solar Pro 4
Public AI IQ model profile with source-backed benchmark results and derived ranking context.
Solar Pro 4 API pricing — full price table, workload cost examples, and cheaper alternatives.
Release and Capabilities
| Public release | 2026-08-12 |
|---|---|
| Modalities | text |
| Context window | 384,000 tokens |
Available through the Upstage API and third-party API providers
Publisher-reported capabilities
- Solar Pro 4 is Upstage's proprietary flagship successor to Solar Pro 3.
- It supports a 384k-token context window and up to 256k output tokens.
Limitations and availability caveats
- The launch is text-only and model weights are not available.
Official release and model references
Measured Coverage and Estimates
Solar Pro 4 has 11 of 39 tracked IQ benchmark inputs across 5 of 7 dimensions. Raw benchmark tables contain source-backed results only. Derived IQ combines all six dimensions using the shared scoring methodology, including estimates where direct coverage is incomplete. Configured predecessor references: Solar Pro 3. A reference is an estimation input, not evidence that this model has the predecessor's measured results.
Among dimensions with direct benchmark coverage, this profile's highest estimated scores are Academic Reasoning (IQ 122) and Reliability (IQ 112). These dimension estimates can include statistical adjustments or predecessor priors; they are not raw benchmark percentages or claims of real-world task success.
Benchmark versions, evaluation harnesses, and coverage affect comparisons; a missing result is not a score of zero. See the scoring methodology for estimation and uncertainty limits.
IQ Dimensions
| Dimension | IQ | Coverage |
|---|---|---|
| Abstract Reasoning | 91 | 0/5 |
| Mathematical Reasoning | 94 | 0/5 |
| Academic Reasoning | 122 | 4/6 |
| Programmatic Reasoning | 103 | 1/6 |
| Computer Use | 97 | 1/5 |
| Reliability | 112 | 2/6 |
| Knowledge Work | 108 | 3/6 |
Benchmark Results
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Frequently Asked Questions
- What is the IQ of Solar Pro 4?
- Solar Pro 4 has an estimated IQ of 104, which ranks #98 out of 159 public models on the AI IQ leaderboard. The score combines seven equally weighted reasoning dimensions using measured benchmark results and conservative estimates for missing coverage.
- How much does Solar Pro 4 cost?
- Solar Pro 4 costs $0.30 per million input tokens and $1.20 per million output tokens. Adjusted for how many tokens it actually consumes on real tasks, its effective cost works out to $1.48 per million input-plus-output tokens.
- Is Solar Pro 4 open source?
- No — Solar Pro 4 is a proprietary model. Its weights are not publicly available, so it is used through hosted APIs and products.
- When was Solar Pro 4 released?
- Solar Pro 4 was publicly released on August 12, 2026.
- How large is the context window of Solar Pro 4?
- Solar Pro 4 supports a context window of 384,000 tokens — the amount of text it can consider in a single request.
- How fast is Solar Pro 4?
- In independent measurements, Solar Pro 4 generates about 109 tokens per second, with a typical response time of about 25 seconds.